CN110094634B - System and method for producing biogas by negative carbon emission biomass - Google Patents
System and method for producing biogas by negative carbon emission biomass Download PDFInfo
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 239000002028 Biomass Substances 0.000 title claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 title abstract description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 170
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 106
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 99
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 67
- 239000001257 hydrogen Substances 0.000 claims abstract description 62
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 62
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 56
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 51
- 230000009467 reduction Effects 0.000 claims abstract description 35
- 230000006837 decompression Effects 0.000 claims abstract description 21
- 239000002699 waste material Substances 0.000 claims abstract description 8
- 239000007789 gas Substances 0.000 claims description 30
- 238000005406 washing Methods 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 11
- 238000007599 discharging Methods 0.000 claims description 7
- 230000008878 coupling Effects 0.000 abstract description 4
- 238000010168 coupling process Methods 0.000 abstract description 4
- 238000005859 coupling reaction Methods 0.000 abstract description 4
- 241000196324 Embryophyta Species 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000003345 natural gas Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 239000012043 crude product Substances 0.000 description 4
- 239000005431 greenhouse gas Substances 0.000 description 4
- 150000002431 hydrogen Chemical class 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 239000013589 supplement Substances 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000012510 hollow fiber Substances 0.000 description 2
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 241000195493 Cryptophyta Species 0.000 description 1
- 240000000731 Fagus sylvatica Species 0.000 description 1
- 235000010099 Fagus sylvatica Nutrition 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000002354 daily effect Effects 0.000 description 1
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- 239000002803 fossil fuel Substances 0.000 description 1
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- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M1/00—Apparatus for enzymology or microbiology
- C12M1/107—Apparatus for enzymology or microbiology with means for collecting fermentation gases, e.g. methane
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/34—Hydrogen distribution
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/45—Hydrogen technologies in production processes
Abstract
The invention relates to a system and a method for producing biogas by negative carbon emission biomass2Jar, methanation assembly, desicator and storage methane tank, high pressure water tower is equipped with coarse marsh gas feed inlet, circulation feed inlet, bottom discharge gate and top discharge gate, and high pressure water tower's top discharge gate passes through the tube coupling desicator, and high pressure water tower's bottom discharge gate passes through the tube coupling decompression unit, and the discharge gate of decompression unit is connected and is stored up CO2The tank and the pressure reduction unit are also provided with a return pipeline connected with a crude methane feeding hole or a circulating feeding hole of the high-pressure water tower for storing CO2The tank and the hydrogen supply unit are respectively connected with a methanation device, a discharge port of the methanation device is connected with a dryer, and a discharge port of the dryer is connected with a methane storage tank. The invention can separate methane and carbon dioxide thoroughly, and can fully utilize waste electric energy generated by clean energy, thereby realizing the full utilization of carbon resources in the methane.
Description
Technical Field
The invention belongs to the field of carbon emission reduction and efficient utilization of clean energy, and particularly relates to a system and a method for producing biogas by using negative carbon emission biomass.
Background
Global energy demand has increased dramatically since industrialization, and fossil fuels now account for over 70% of the total. Despite the strong growth potential of renewable energy, the main position of fossil energy is still hard to be shocked in the next 30 years. The european union has formulated and issued "strategy for development of renewable energy" white paper in 1997, which stipulates the proportion of renewable energy among all the energy consumed, while 87% of the composition of renewable energy is biomass methane. The biomass biogas is a combustible gas produced by fermenting agricultural and forestry waste organic matters (straws, algae, kitchen garbage and the like) in an anaerobic environment at a certain temperature, humidity and pH value through microorganisms. It is composed of 50% -80% methane (CH)4) 20% -40% of carbon dioxide (CO)2) 0% -5% of nitrogenQi (N)2)、<1% hydrogen (H)2)、<0.4% oxygen (O)2) With 0.1% -3% hydrogen sulfide (H)2S), and the like. The use of fossil energy results in a large carbon dioxide emission, which accounts for more than 90% of the total emission, while the carbon dioxide produced by the production of biogas is not negligible. In 2017, the global carbon dioxide emission related to energy is recovered and increased again, the highest point of the history of 325 hundred million tons is reached, and the state that the global carbon dioxide emission is leveled for three years is broken. CO 22The concentration is increased sharply, and a series of severe problems such as extreme weather, glacier melting, ocean acidification and the like are brought about, so that the living environment of human beings is seriously threatened.
With the continuous development of society, the demand of energy is continuously increasing, and the requirements of people on the environment are continuously improved, so that the biogas is more and more concerned by people as a clean energy. Because the marsh gas contains CO with higher concentration2And H2S, so a corresponding purification process is required to remove impurity gases therein. Generally, the biogas needs to be purified and separated by purifying equipment, and the purified biogas can be stored and conveyed in a gas or liquid state. The biogas purification technology of European countries is mature, and the concentration of CH4 in the purified biogas can reach about 95%, which is equivalent to the standard of natural gas (the concentration of CH4 in high-quality natural gas is more than 95%).
In the process of biogas production, purified methane can be used as fuel and the like, while carbon dioxide is usually directly discharged, which does not conform to low-carbon and sustainable development strategies. The carbon dioxide in the methane production process is captured and used for hydro-conversion, the negative carbon dioxide emission target in the combined process can be realized, the method is an effective way for treating greenhouse gases, and the method has reference significance for other emission reduction requirements.
Patent CN104003832B discloses a process and a device system for simultaneously purifying methane and carbon dioxide from biogas: after being compressed and pressurized by a compressor I, the biogas raw material enters a pretreatment device I for pretreatment; then enters a first-stage hollow fiber membrane to separate CH4Crude product and CO2A crude product; CH (CH)4The crude product enters through a second-stage hollow fiber membraneDeeply purifying and separating to obtain CH meeting the vehicle gas standard GB18047-20004Producing a product; CO 22Subjecting the crude product to CO2The recovery device is used for purifying and separating to obtain CO meeting the industrial carbon dioxide standard GB/T6052-20112The product, but the system can not realize the full utilization of carbon resources and zero emission of greenhouse gases.
Disclosure of Invention
The invention aims to solve the problems and provide a system and a method for producing biogas by using negative carbon emission biomass.
The purpose of the invention is realized by the following technical scheme:
a system for producing biogas by negative carbon emission biomass comprises a high-pressure water tower, a pressure reduction unit, a hydrogen supply unit and a CO storage unit2Jar, methanation assembly, desicator and storage methane tank, high pressure water tower is equipped with coarse marsh gas feed inlet, circulation feed inlet, bottom discharge gate and top discharge gate, high pressure water tower's top discharge gate passes through the tube coupling desicator, high pressure water tower's bottom discharge gate passes through the tube coupling decompression unit, the discharge gate connection of decompression unit stores up CO2The pressure reducing unit is also provided with a return pipeline connected with a crude methane feeding hole or a circulating feeding hole of the high-pressure water tower, and the CO storage unit is used for storing CO2The tank and the hydrogen supply unit are respectively connected with a methanation device, a discharge port of the methanation device is connected with a dryer, and a discharge port of the dryer is connected with a methane storage tank.
Further, the crude methane feeding hole is formed in the middle lower portion of the high-pressure water tower, and the circulating feeding hole is formed in the middle upper portion of the high-pressure water tower.
Further, the pressure reduction unit comprises a first-stage pressure reduction tank and a second-stage pressure reduction tank, the outlet end of the first-stage pressure reduction tank is connected with the inlet end of the second-stage pressure reduction tank, the outlet end of the mixed gas is connected with the crude methane feeding port, and the gas outlet of the second-stage pressure reduction tank is connected with the CO storage tank2The tank is connected, and the water outlet is connected with the circulating feed inlet of the high-pressure water tower.
Further, external water supplement is connected with a water outlet of the secondary pressure reduction tank.
Furthermore, the crude methane feeding hole and the circulating feeding hole are provided with booster pumps.
Further, the hydrogen supply unit comprises a device for electrolyzing the water to produce hydrogen and a hydrogen storage tank, wherein the hydrogen storage tank stores the hydrogen generated by the device for electrolyzing the water to produce hydrogen.
Furthermore, the device for electrolyzing the water to produce the hydrogen supplies power by waste electric energy generated by clean energy. The phenomenon that a large amount of electric energy cannot be used in a power grid due to the fact that the intermittent peak-to-valley ratio of the electric energy generated by clean energy sources such as light, wind, tidal energy and the like is too large at present is caused, and the electric energy which is partially used can be used for electrolyzing water to prepare hydrogen and storing the hydrogen.
Furthermore, the pressure in the high-pressure water tower is 8-10Mpa, the leacheate in the high-pressure water tower mainly comes from the effluent in the secondary decompression tank, and part of the leacheate comes from the outside water supplement and flows into the high-pressure water tower for use after passing through the booster pump. The pressure in the first-stage pressure reduction tank is 6-9MPa, namely, the pressure is reduced to 75% -90% of the initial pressure, residual methane and a small amount of carbon dioxide in the discharged water are discharged, and the discharged mixed gas flows back to the high-pressure water tower to be washed and separated again. The pressure in the secondary decompression tank is 0.3-0.5MPa, and the solubility content of carbon dioxide is the lowest at the moment, so that the carbon dioxide can be almost completely released from water.
Further, the molar ratio of hydrogen to carbon dioxide in the methanation device is (4-4.4): 1.
a treatment method of a system for producing biogas by negative carbon emission biomass comprises the steps of pumping crude biogas through the system, then feeding the crude biogas into a high-pressure water tower, dissolving carbon dioxide in the biogas into water washing liquid, separating methane from the upper end of the high-pressure water tower in a gas form, and drying the methane to enter a methane storage tank (8); the water washing liquid with dissolved carbon dioxide enters a decompression unit, all residual methane in the water washing liquid is released under reduced pressure, simultaneously carbon dioxide is discharged, and the carbon dioxide is collected until CO is stored2In the tank (11), CO2The hydrogen and the hydrogen of the hydrogen supply unit enter a methanation device (6) together to generate methane, and the methane enters a methane storage tank (8) after being dried; after the mixed gas of the pressure reduction unit is mixed with the crude biogas, the mixed gas is sent into a high-pressure water tower through a booster pump to be washed and separated again, and the washing liquid which releases carbon dioxide flows back to the high-pressure water tower through the booster pump to process the crude biogas.The system hydrogenates carbon dioxide released from the crude biogas to generate methane, and the methane is dried and mixed with methane separated from the crude biogas.
Compared with the prior art, the invention has the following characteristics:
(1) the methane and the carbon dioxide are separated thoroughly: the carbon dioxide and the methane are completely separated through high-pressure water washing and two-stage decompression, and partial sulfide and particulate matters in the methane are dissolved in water.
(2) Clean energy is fully utilized, waste electric energy is utilized to electrolyze water to produce hydrogen, and the hydrogen is placed in a hydrogen storage tank for standby.
(3) The carbon dioxide is effectively utilized, the hydrogen and the carbon dioxide react to generate methane through methanation, and the redundant hydrogen and the generated methane are introduced into a gas storage tank through a dryer and are mixed with the methane purified from the crude methane.
The invention utilizes the excessive electric energy which is generated by clean energy and can not be merged into the national power grid at present to prepare hydrogen and react with carbon dioxide to generate methane, converts all carbon in the methane into methane, and recycles and reflows the water washing liquid of the secondary decompression tank into the high-pressure water tower. The high-pressure water washing has the advantages of high separation efficiency, mild operation conditions, easily obtained reaction materials, high economical efficiency and the like, and reduces the actual operation cost. The whole system realizes the full utilization of carbon resources, zero emission of greenhouse gases, no wastewater and waste gas emission, and the renewable energy is utilized to the maximum extent.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
in the figure: a high-pressure water tower 1, a primary pressure reducing tank 2, a secondary pressure reducing tank 3, an electrolytic water hydrogen production device 4, a hydrogen storage tank 5, a methanation device 6, a dryer 7, a methane storage tank 8, booster pumps 9, 10, and CO storage2A tank 11, and externally replenishing water 12.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
A system for producing biogas by negative carbon emission biomass comprises a high-pressure water tower 1, a pressure reduction unit, a hydrogen supply unit and a CO storage unit2The high-pressure water tower 1 is provided with a coarse methane feeding hole, a circulating feeding hole, a bottom discharging hole and a top discharging hole, the coarse methane feeding hole is arranged at the middle lower part of the high-pressure water tower 1, the circulating feeding hole is arranged at the middle upper part of the high-pressure water tower 1, and the coarse methane feeding hole and the circulating feeding hole are provided with booster pumps 9 and 10.
The top end discharge port of the high-pressure water tower 1 is connected with the dryer 7 through a pipeline, the bottom end discharge port of the high-pressure water tower 1 is connected with the pressure reducing unit through a pipeline, and the discharge port of the pressure reducing unit is connected with the CO storage tank2The tank 11 and the pressure reduction unit are also provided with a return pipeline connected with a crude methane feeding hole or a circulating feeding hole of the high-pressure water tower 1 for storing CO2The tank 11 and the hydrogen supply unit are respectively connected with the methanation device 6, the discharge port of the methanation device 6 is connected with the dryer 7, and the discharge port of the dryer 7 is connected with the methane storage tank 8.
The pressure reduction unit comprises a first-stage pressure reduction tank 2 and a second-stage pressure reduction tank 3, the outlet end of the first-stage pressure reduction tank 2 is connected with the inlet end of the second-stage pressure reduction tank 3, the outlet end of the mixed gas is connected with the crude methane feed inlet, and the gas outlet of the second-stage pressure reduction tank 3 is connected with the CO storage tank2The tank 11 is connected, and the water outlet is connected with the circulating feed inlet of the high-pressure water tower 1. The external water supplement 12 is connected with the water outlet of the secondary decompression tank 3. The hydrogen supply unit comprises a device 4 for electrolyzing the water to produce hydrogen and a hydrogen storage tank 5, wherein the hydrogen storage tank 5 stores the hydrogen generated by the device 4 for electrolyzing the water to produce the hydrogen. The device 4 for electrolyzing the aquatic product hydrogen supplies power by waste electric energy generated by clean energy.
The pressure in the high-pressure water tower is 8-10Mpa, the leacheate in the high-pressure water tower mainly comes from the effluent water in the secondary decompression tank, and part of the leacheate comes from the water supplement outside and flows into the high-pressure water tower for use after passing through the booster pump. The pressure in the first-stage pressure reduction tank is 6-9MPa, namely, the pressure is reduced to 75% -90% of the initial pressure, all methane and a small amount of carbon dioxide in the discharged water are discharged, and the discharged mixed gas flows back to the high-pressure water tower to be washed and separated again. The pressure in the secondary decompression tank is 0.3-0.5MPa, and the solubility content of carbon dioxide is the lowest at the moment, so that the carbon dioxide can be almost completely released from water. The molar ratio of hydrogen to carbon dioxide in the methanation device is 4-4.4: 1.
the specific working process is that the crude methane is extracted by the system and then enters the high-pressure water tower through the booster pump, carbon dioxide in the methane in the high-pressure water tower is dissolved in water washing liquid, and most of the methane can be separated in a gas form due to low solubility. The separated methane enters a gas storage tank after passing through drying equipment; the water washing liquid with dissolved carbon dioxide enters a first-stage decompression tank, all residual methane in the water washing liquid is released under decompression, and a small amount of carbon dioxide is discharged; and mixing the mixed gas released from the first-stage pressure reduction tank with the crude methane, and then sending the mixed gas into a high-pressure water tower through a booster pump for water washing and separation again. And the water washing liquid which is dissolved with the carbon dioxide and flows out of the first-stage decompression tank flows into the second-stage decompression tank again to release all the carbon dioxide in the water, and the carbon dioxide gas is introduced into the gas storage tank for standby. The water scrubbing liquid releasing carbon dioxide flows back to the high-pressure water tower after passing through the booster pump to treat the crude methane. The method and the system of the invention utilize the hydrogen prepared by the excessive electric energy generated by the clean energy to react with the carbon dioxide captured from the crude biogas to generate methane, can completely convert the carbon in the biogas into methane, realize the full utilization of carbon resources, realize zero emission of greenhouse gases, simultaneously have no wastewater and waste gas emission, and maximally utilize the clean energy.
Example 1
10000 tons of biomass methane produced per day in a certain factory in Nibo of Zhejiang, which contains CH4(5000t-8000t)，CO2(2000t-4000t), wherein CO2The equation for the hydrogenation reduction to methane is as follows:
CO2(g)+4H2(g)→CH4(g)+2H2O ΔrHm(298.15K)＝-164.9KJ/mol
electrolyzing water:
H2O(L)→H2(g)+1/2O2(g) ΔrHm(298.15K)＝285.838KJ/mol
the carbon dioxide purification rate is calculated by 99 percent, and the carbon dioxide is obtained after passing through the two-stage decompression tank;
CO2is in a total amount of MC＝(2000～4000)×99％＝(1980～3960)t
According to claim 5, the ratio of hydrogen to carbon dioxide is (4-4.4): 1. the total weight of hydrogen required is then:
Mhydrogen max＝3960t÷44×4.4÷2＝198t
MHydrogen min＝1980t÷44×4÷2＝90t
1 degree electric-3.6 × 106J
From the molar enthalpy of formation of hydrogen from electrolysis of water, 1mol (2g) of H is formed2When 285.838KJ heat needs to be absorbed, the energy for generating 198t hydrogen and 90t hydrogen respectively is 2.83 × 1010KJ，1.29×1010KJ, i.e. 7860545, 3572975 degrees electrical, respectively. According to the calculation of 2400-degree electricity of 1MW daily photovoltaic power generation, 1.488 GW-3.275 GW is needed every day, which is smaller than the waste electricity quantity discarded by the current peripheral photovoltaic power generation, and the practical contribution of energy conservation and emission reduction is realized.
Example 2
Byproduct CO of industrial methane of certain factory in Jiaxing of Zhejiang2The conversion is carried out by the factory utilizing the waste electric energy generated by the photovoltaic power generation without carbon emission to electrolyze water to prepare hydrogen, and then reacting the hydrogen with carbon dioxide separated from the biogas to complete the conversion. Its final products are hydrogen and synthetic methane gas. The plant achieves carbon dioxide conversion by two processes: electrolyzed water and carbon dioxide methanation. First, the plant uses photovoltaics that produce excess energy to split water into oxygen and hydrogen, and stores the hydrogen. Then, methanation of the carbon dioxide extracted from the raw biogas: hydrogen and CO2The reaction produces synthetic methane. The concentration of the generated synthetic methane gas exceeds 97 percent, and is the same as that of the common natural gas in practical application. Distributed to gas stations in various locations through the existing infrastructure, i.e., the natural gas network. The plant began delivering gas to the natural gas network in the fall of 2013. The plant produces about 1000 tons of synthetic methane gas per year, eliminating about 2800 tons of CO2And (5) discharging. This roughly corresponds to the amount absorbed a year by over 220000 beech forests. The only by-products of the plant are water and oxygen, which are environmentally friendly. The plant shows how large amounts of green electricity can be efficiently and independently stored: by converting it to methane and storing it in the largest energy storage facility natural gas network.
The embodiments described above are described to facilitate an understanding and use of the invention by those skilled in the art. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (5)
1. The system for producing the biogas by using the biomass with negative carbon emission is characterized by comprising a high-pressure water tower (1), a pressure reduction unit, a hydrogen supply unit and CO storage2A tank (11), a methanation device (6), a dryer (7) and a methane storage tank (8),
the high-pressure water tower (1) is provided with a crude methane feeding hole, a circulating feeding hole, a bottom discharging hole and a top discharging hole, the top discharging hole of the high-pressure water tower (1) is connected with the dryer (7) through a pipeline, the bottom discharging hole of the high-pressure water tower (1) is connected with the pressure reducing unit through a pipeline,
the discharge hole of the pressure reduction unit is connected with CO storage2A tank (11), the pressure reducing unit is also provided with a return pipeline connected with a crude methane feeding hole or a circulating feeding hole of the high-pressure water tower (1),
said store CO2The tank (11) and the hydrogen supply unit are respectively connected with a methanation device (6), a discharge hole of the methanation device (6) is connected with a dryer (7),
the discharge hole of the dryer (7) is connected with a methane storage tank (8),
the pressure reduction unit comprises a first-stage pressure reduction tank (2) and a second-stage pressure reduction tank (3), the outlet end of the first-stage pressure reduction tank (2) is connected with the inlet end of the second-stage pressure reduction tank (3), the outlet end of the mixed gas is connected with the crude methane feed inlet, and the gas outlet of the second-stage pressure reduction tank (3) is connected with the CO storage tank2The tank (11) is connected, and the water outlet is connected with the circulating feed inlet of the high-pressure water tower (1); the pressure in the high-pressure water tower is 8-10MPa, the pressure in the primary decompression tank is 6-9MPa, and the pressure in the secondary decompression tank is 0.3-0.5 MPa;
the hydrogen supply unit comprises a device (4) for electrolyzing the water to produce hydrogen and a hydrogen storage tank (5), wherein the hydrogen storage tank (5) stores the hydrogen generated by the device (4) for electrolyzing the water to produce hydrogen; the device (4) for electrolyzing the aquatic product hydrogen supplies power by waste electric energy generated by clean energy.
2. The system for generating biogas from negative carbon-emitting biomass as recited in claim 1, wherein the external make-up water (12) is connected to the water outlet of the secondary decompression tank (3).
3. The system for producing biogas from negative carbon-emitting biomass as recited in claim 1, wherein the crude biogas feed port and the recycle feed port are provided with booster pumps (9, 10).
4. The system for generating biogas from negative carbon emission biomass according to any one of claims 1 to 3, wherein the molar ratio of hydrogen to carbon dioxide in the methanation unit is (4-4.4): 1.
5. the method for processing the system for generating the biogas from the negative-carbon-emission biomass according to claim 1,
the crude biogas is extracted by the system and then enters a high-pressure water tower, carbon dioxide in the biogas is dissolved in water washing liquid, methane is separated from the upper end of the high-pressure water tower in a gas form and then enters a methane storage tank (8) after being dried;
the water washing liquid with dissolved carbon dioxide enters a decompression unit, all residual methane in the water washing liquid is released under reduced pressure, simultaneously carbon dioxide is discharged, and the carbon dioxide is collected until CO is stored2In the tank (11), CO2The hydrogen and the hydrogen of the hydrogen supply unit enter a methanation device (6) together to generate methane, and the methane enters a methane storage tank (8) after being dried;
and after the mixed gas of the pressure reduction unit is mixed with the crude biogas, the mixed gas is sent into a high-pressure water tower through a booster pump to be washed and separated again, and the washing liquid of the carbon dioxide released by the pressure reduction unit flows back to the high-pressure water tower through the booster pump to treat the crude biogas.
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| CN114033514A (en) * | 2021-12-09 | 2022-02-11 | 中国华能集团清洁能源技术研究院有限公司 | Biomass negative carbon emission power generation system and working method thereof |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0083832A1 (en) * | 1982-01-12 | 1983-07-20 | Seitetsu Kagaku Co., Ltd. | Process for separating carbonic acid gas from methane-rich gas |
| CN102173508A (en) * | 2011-01-26 | 2011-09-07 | 广西必佳微生物工程有限责任公司 | Method for producing biogas for vehicles by utilizing high concentration organic wastewater and waste residues |
| CN102321676A (en) * | 2011-09-07 | 2012-01-18 | 乌鲁木齐市隆盛达环保科技有限公司 | Biogas engineering two gas one fertile complex method |
| CN102329672A (en) * | 2011-09-06 | 2012-01-25 | 北京昊业怡生科技有限公司 | Method for separating and producing methane and carbon dioxide from marsh gas |
| CN102492506A (en) * | 2011-12-12 | 2012-06-13 | 中国科学院广州能源研究所 | Method and device for removing carbon dioxide in methane by organic waste water |
| CN103952199A (en) * | 2014-03-07 | 2014-07-30 | 曹恒勇 | Biogas purification method and device used for glass craft production |
| CN205024189U (en) * | 2015-08-02 | 2016-02-10 | 湘潭大学 | Decarbonization device of biological natural gas of marsh gas preparation |
| CN105602838A (en) * | 2016-02-02 | 2016-05-25 | 中国科学院成都有机化学有限公司 | Biogas methanation decarbonization system and method |
| CN106744956A (en) * | 2016-12-22 | 2017-05-31 | 乐陵胜利新能源有限责任公司 | A kind of high-pressure washing methane purification carbon dioxide in process recovery process |
-
2019
- 2019-04-09 CN CN201910281264.1A patent/CN110094634B/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0083832A1 (en) * | 1982-01-12 | 1983-07-20 | Seitetsu Kagaku Co., Ltd. | Process for separating carbonic acid gas from methane-rich gas |
| CN102173508A (en) * | 2011-01-26 | 2011-09-07 | 广西必佳微生物工程有限责任公司 | Method for producing biogas for vehicles by utilizing high concentration organic wastewater and waste residues |
| CN102329672A (en) * | 2011-09-06 | 2012-01-25 | 北京昊业怡生科技有限公司 | Method for separating and producing methane and carbon dioxide from marsh gas |
| CN102321676A (en) * | 2011-09-07 | 2012-01-18 | 乌鲁木齐市隆盛达环保科技有限公司 | Biogas engineering two gas one fertile complex method |
| CN102492506A (en) * | 2011-12-12 | 2012-06-13 | 中国科学院广州能源研究所 | Method and device for removing carbon dioxide in methane by organic waste water |
| CN103952199A (en) * | 2014-03-07 | 2014-07-30 | 曹恒勇 | Biogas purification method and device used for glass craft production |
| CN205024189U (en) * | 2015-08-02 | 2016-02-10 | 湘潭大学 | Decarbonization device of biological natural gas of marsh gas preparation |
| CN105602838A (en) * | 2016-02-02 | 2016-05-25 | 中国科学院成都有机化学有限公司 | Biogas methanation decarbonization system and method |
| CN106744956A (en) * | 2016-12-22 | 2017-05-31 | 乐陵胜利新能源有限责任公司 | A kind of high-pressure washing methane purification carbon dioxide in process recovery process |
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